Mortgage calculator
Estimate your monthly payment, total interest, and full amortization schedule for a 30-year fixed mortgage. All inputs update live. Share your scenario as a URL.
Last updated 2026-05-13
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Coming in future releasesMethodologyHow we calculate this
How we calculate this
Monthly principal & interest uses the standard closed-form amortization formula M = P · r(1+r)n / ((1+r)n−1), where P is the loan principal, r the monthly rate, and n the number of payments.
Property tax uses each state's median effective rate (cross-referenced with Tax Foundation and Census Bureau ACS data). Homeowner insurance is a default estimate — edit it to match your actual quote. Local taxes (NYC, Yonkers, Philadelphia, San Francisco, etc.) are not included.
PMI is tiered by initial LTV: 0.50% (LTV 80-85%), 0.75% (85-90%), 1.00% (90-95%), 1.25% (LTV ≥ 95%) — reflecting FNMA Form 4030 guidance. PMI auto-removes when the loan balance reaches 78% of the original home value, per the Homeowners Protection Act.
Rate benchmarks come from the Federal Reserve H.15 weekly release. This calculator does not include closing costs (typically 2–5% of the loan), discount points, or local transfer taxes. See our full methodology for sources, assumptions, and limitations.